Ultra-high speed motor

Abstract

The application discloses an ultra-high-speed motor, which comprises a shell, a rotating mechanism and a stator, the shell is filled with heat-conducting oil, the rotating mechanism extends into the shell, and the stator is installed on the inner wall of the shell; the rotating mechanism comprises a rotating shaft, a rotor and a rotating body, the rotor is installed on the rotating shaft, a cavity is formed in the rotating shaft, one end of the rotating shaft extending into the heat-conducting oil is connected with the rotating body so as to draw the heat-conducting oil into the cavity; an oil injection hole is formed at the end of the rotating shaft away from the rotating body, the oil injection hole is communicated with the cavity so as to spray the heat-conducting oil in the cavity into the shell. In the ultra-high-speed motor, the heat dissipation of the rotor is realized by relying on the self-circulation of the heat-conducting oil formed by the rotation of the rotating shaft, and the motor has the advantages of simple heat dissipation structure, reliable heat exchange mode and the like, can effectively reduce the working temperature of the rotor in a vacuum environment, avoids the demagnetization of the magnetic steel caused by high temperature, and prolongs the service life of the magnetic steel.

Description

Technical Field

[0001] This application relates to the field of ultra-high speed motor rotor heat dissipation technology, and in particular to an ultra-high speed motor. Background Technology

[0002] Motors with a maximum speed exceeding 30,000 rpm are generally referred to as ultra-high-speed motors. Due to their compact structure, high power density, and excellent high-speed performance, ultra-high-speed motors are widely used in aerospace, powder metallurgy, flywheel energy storage, as well as in the separation and purification processes of the nuclear industry and biomedicine.

[0003] As the motor speed increases, rotor air wear increases, and heat generation becomes more severe. To reduce rotor air wear, the area occupied by the air between the rotor and stator is completely sealed off and placed in a vacuum state when the motor is running. The heat generated by rotor air wear can be transferred to the stator or housing through limited convection and radiation, and then the heat inside the motor is conducted to the surrounding air through the housing.

[0004] However, the aforementioned heat dissipation methods require that the vacuum level inside the motor not be too high; otherwise, it will lead to poor rotor heat dissipation, reduced motor power, wire softening, and high-temperature demagnetization, severely limiting the improvement of the speed and power of ultra-high-speed motors. The heat dissipation problem of the rotor in a vacuum environment has become a challenge in the design of ultra-high-speed motors. Summary of the Invention

[0005] This invention provides an ultra-high-speed motor to solve the technical problem of poor heat dissipation of the internal rotor in motors with high vacuum in the prior art.

[0006] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0007] In a first aspect, the present invention provides an ultra-high-speed motor, comprising a housing, a rotating mechanism, and a stator. The housing contains heat-conducting oil, the rotating mechanism extends into the housing, and the stator is mounted on the inner wall of the housing. The rotating mechanism includes a shaft, a rotor, and a rotating body. The rotor is mounted on the shaft, and a cavity is formed within the shaft. One end of the shaft extending into the heat-conducting oil is connected to the rotating body to draw the heat-conducting oil into the cavity. An oil spray hole is formed at the end of the shaft away from the rotating body, and the oil spray hole communicates with the cavity to spray the heat-conducting oil entering the cavity into the housing.

[0008] Furthermore, the housing includes a first cavity and a second cavity separated by upper and lower dimensions. The heat transfer oil is contained in the lower first cavity, and the rotor and the stator are located in the upper second cavity. The inner wall of the second cavity has multiple oil return channels, which are connected to the first cavity. The heat transfer oil passes through the cavity and is sprayed out through the oil injection hole into the second cavity and flows to the oil return channels so that the heat transfer oil flows back to the first cavity.

[0009] Furthermore, the cross-section of the oil return channel is shaped like a waist hole.

[0010] Furthermore, the inlets of the multiple oil return channels are evenly distributed on the inner wall of the housing of the second cavity.

[0011] Furthermore, the upper end face of the stator is flush with the bottom of the inlet of the oil return channel.

[0012] Furthermore, an oil-drawing groove is formed on the outer wall of the rotating body, and a blind hole is formed at one end of the rotating body that is connected to the rotating shaft. The blind hole extends along the axial direction of the rotating body, and the oil-drawing groove communicates with the cavity of the rotating shaft through the blind hole.

[0013] Furthermore, the rotating body is cylindrical or conical in shape.

[0014] Furthermore, a notch is formed on the outer wall of the rotating body, and the oil-drawing groove is located within the notch. The position of the oil-drawing groove within the notch is set relative to the direction in which the heat-conducting oil enters the notch.

[0015] Furthermore, there are two notches, and the two notches are arranged in a centrally symmetrical manner on the outer wall of the rotating body.

[0016] Furthermore, the cross-sectional diameter of the upper end of the rotating body is smaller than that of the lower end, and the upper end of the rotating body is inserted into the rotating shaft and is interference-fitted with the rotating shaft.

[0017] Furthermore, the rotating mechanism also includes bearings, with the bearings respectively disposed at the top and bottom of the rotating shaft; a bearing seat is disposed inside the housing, the bearing seat extending from the inner wall of the housing toward the rotating shaft and abutting against the bearing at the bottom; the ultra-high speed motor includes an end cover, the end cover being disposed at the top of the housing and forming a through hole, the rotating shaft extending into the housing through the through hole, and the bearing at the top of the rotating shaft abutting against the inner wall of the end cover.

[0018] Furthermore, multiple fins are formed on the outer periphery of the shell for heat dissipation, and the multiple fins are evenly distributed on the outer wall of the shell.

[0019] The ultra-high-speed motor provided by this invention has a rotating body installed at the bottom of the shaft and a cavity set inside the shaft. The rotating body draws heat transfer oil into the cavity of the shaft and sprays the heat transfer oil into the housing through the oil spray hole at the top of the shaft. The heat transfer oil can flow back into the heat transfer oil in the housing, completing the circulation loop of the heat transfer oil. The heat transfer oil passing through the shaft cavity can carry the heat on the rotor to the housing and the heat transfer oil in the housing through circulation, thereby rapidly cooling the rotor.

[0020] The rotor heat dissipation method of the ultra-high speed motor of the present invention relies on the self-circulation of heat-conducting oil formed by the rotation of the shaft. It has the advantages of simple heat dissipation structure and reliable heat exchange method. It can effectively reduce the operating temperature of the rotor when running in a vacuum environment, avoid the phenomenon of high temperature demagnetization of magnets, and improve the service life of magnets. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the rotor heat dissipation structure of the ultra-high speed motor in an embodiment of the present invention;

[0023] Figure 2 for Figure 1 Schematic diagram of the structure of a rotating body;

[0024] Figure 3 for Figure 2 Top view of a solid of revolution.

[0025] Figure label:

[0026] 10. Shell; 11. First cavity; 12. Second cavity; 13. Oil return channel; 14. Bearing housing; 15. Fin;

[0027] 21. Shaft; 211. Cavity; 212. Oil injection hole; 22. Bearing; 23. Rotor; 24. Rotating body; 241. Oil suction groove; 242. Notch; 243. Blind hole;

[0028] 30. Stator; 40. End cap; 50. Heat transfer oil. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0031] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0033] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0034] like Figure 1As shown, this application embodiment provides an ultra-high-speed motor, including a housing 10, a rotating mechanism, and a stator 30. The housing 10 contains heat transfer oil 50. The rotating mechanism extends into the housing 10, and the stator 30 is mounted on the inner wall of the housing 10. The rotating mechanism includes a shaft 21, a rotor 23, and a rotating body 24. The rotor 23 is mounted on the shaft 21, and a cavity 211 is formed within the shaft 21. One end of the shaft 21, into which the heat transfer oil 50 is inserted, is connected to the rotating body 24 to draw the heat transfer oil 50 into the cavity 211. An oil spray hole 212 is formed at the end of the shaft 21 away from the rotating body 24. The oil spray hole 212 communicates with the cavity 211 to spray the heat transfer oil 50 entering the cavity 211 into the housing 10.

[0035] The heat dissipation method for the rotor of an ultra-high-speed motor under vacuum conditions mainly involves the rotor radiating heat to the stator or housing of the motor at a certain vacuum level, and then the housing conducts the heat from inside the motor to the surrounding air. This heat dissipation method requires that the vacuum level inside the motor not be too high; otherwise, the rotor will be unable to radiate heat to the stator, leading to poor heat dissipation, rotor demagnetization due to high temperature, wire softening, and decreased motor efficiency.

[0036] In addition, the small internal space of the motor makes it impossible to install complex convection and heat dissipation devices. Furthermore, since the motor is in a vacuum environment, there is a lack of effective heat transfer medium, which reduces the heat dissipation efficiency of the rotor by the aforementioned convection and radiation methods, thus limiting the improvement of the power and speed of the vacuum motor.

[0037] In this embodiment, a rotating body 24 is installed at the bottom of the rotating shaft 21 and a cavity 211 is provided inside the rotating shaft 21. The rotating body 24 draws heat transfer oil 50 into the cavity 211 of the rotating shaft 21, and sprays the heat transfer oil 50 into the housing 10 through the oil spray hole 212 at the top of the rotating shaft 21. The heat transfer oil 50 can flow back into the heat transfer oil 50 in the housing 10, completing the circulation loop of the heat transfer oil 50. The heat transfer oil 50 passing through the cavity 211 of the rotating shaft 21 can carry the heat on the rotor 23 to the housing 10 and the heat transfer oil 50 in the housing 10 through circulation, thereby making the rotor 23 cool down quickly.

[0038] In this embodiment of the ultra-high speed motor, the rotor 23 is cooled by the self-circulation of the heat-conducting oil 50 generated by the rotation of the shaft 21. This method has the advantages of simple heat dissipation structure and reliable heat exchange method. It can effectively reduce the operating temperature of the rotor 23 under vacuum conditions, avoid the phenomenon of high-temperature demagnetization of the magnets, and improve the service life of the magnets.

[0039] Understandably, the housing 10 is a sealed environment. The heat transfer oil 50 contained within it is circulated by the rotation of the rotating shaft 21, thereby transferring the heat generated by the rotor 23 to the housing 10 of the motor. The bottom of the rotating shaft 21 and the rotating body 24 extend into the heat transfer oil 50. The heat transfer oil 50 is sprayed from the oil injection hole 212 onto the inner wall of the housing 10. Part of the heat is transferred to the housing 10, and the other part of the heat is transferred to the uncirculated heat transfer oil 50 inside the housing 10.

[0040] In this embodiment, the oil injection hole 212 is positioned higher than the upper end faces of the rotor 23 and stator 30. The rotor 23 is interference-fitted onto the shaft 21. A stepped portion is formed on the inner wall of the housing 10, and the bottom end of the stator 30 is located on the stepped portion for positioning the stator 30. The stator 30 is interference-fitted onto the inner wall of the housing 10.

[0041] In some embodiments, the housing 10 includes a first cavity 11 and a second cavity 12 separated by upper and lower dimensions. The heat transfer oil 50 is contained in the lower first cavity 11, and the rotor 23 and stator 30 are located in the upper second cavity 12. The inner wall of the second cavity 12 is formed with a plurality of oil return channels 13, which are connected to the first cavity 11. The heat transfer oil 50 is sprayed out of the cavity 211 through the oil injection hole 212 into the second cavity 12 and enters the oil return channel 13 so that the heat transfer oil 50 flows back to the first cavity 11.

[0042] In this embodiment, the heat transfer oil 50 passes through the cavity 211 within the rotating shaft 21 to the oil spray hole 212 at the top of the rotating shaft 21, and is sprayed from the oil spray hole 212 onto the inner wall of the second cavity 12. It then flows through the inner wall to the oil return channel 13, and returns to the first cavity 11 through the oil return channel 13. The arrangement of multiple oil return channels 13 increases the contact area between the heat transfer oil 50 and the housing 10, thereby expanding the heat dissipation surface area.

[0043] Furthermore, the inlets of multiple oil return channels 13 are evenly distributed on the inner wall of the shell 10 of the second cavity 12. The evenly distributed inlets of the oil return channels 13 ensure that the heat transfer oil 50 sprayed onto the inner wall flows into the oil return channels 13.

[0044] Specifically, the cross-section of the oil return channel 13 is shaped like a waist hole. The waist hole shape of the oil return channel 13 allows the heat transfer oil 50 to flow down into the oil return channel 13, thus increasing the contact area between the heat transfer oil 50 and the housing 10 and enhancing the heat dissipation effect of the housing 10 on the heat transfer oil 50.

[0045] Understandably, the fixed position of the stator 30 on the inner wall of the housing 10 should not affect the flow of heat transfer oil 50 into the return oil channel 13. In some embodiments, the upper end face of the stator 30 is flush with the bottom of the inlet of the return oil channel 13. (Refer to...) Figure 1The end coils of the stator 30 are vacuum-sealed with adhesive. The upper surface of the adhesive is lower than the position of the oil injection hole 212. In this embodiment, an annular groove is formed between the adhesive and the inner wall of the housing 10, that is, the top of the adhesive is higher than the inlet of the oil return channel 13, while the upper surface of the stator 30 is flush with the bottom of the inlet of the oil return channel 13. The annular groove is used to guide the heat transfer oil 50.

[0046] In some embodiments, an oil-drawing groove 241 is formed on the outer wall of the rotating body 24, and a blind hole 243 is formed at one end of the rotating body 24 connected to the rotating shaft. The blind hole 243 extends along the axial direction of the rotating body 24, and the oil-drawing groove 241 communicates with the cavity of the rotating shaft through the blind hole 243.

[0047] In this embodiment, an oil-drawing tank 241 is disposed on the outer wall of the rotating body 24 for drawing heat-conducting oil 50 from the housing. A blind hole 243 is formed on the rotating body 24, and the oil-drawing tank 241 communicates with the blind hole 243. When the rotating body 24 is connected to the rotating shaft, the blind hole 243 communicates with the cavity of the rotating shaft. The blind hole 243 is arranged along the axial direction of the rotating body 24, allowing the heat-conducting oil 50 in the blind hole 243 to enter the cavity of the rotating shaft when the rotating body 24 rotates together with the rotating shaft. During the rotation of the rotating body 24 and the rotating shaft 21, the heat-conducting oil 50 flows through the oil-drawing tank 241 into the blind hole 243, and then flows through the blind hole 243 into the cavity 211 of the rotating shaft 21.

[0048] In this embodiment, the arrangement of the oil-drawing groove 241 on the rotating body 24 is not limited. It can extend from the bottom to the top of the rotating body 24, or from a certain position at the bottom to the top; it can also be arranged only in the middle of the rotating body 24. The opening depth of the blind hole 243 is related to the arrangement position of the oil-drawing groove 241. The bottom end of the blind hole 243 can be set to be flush with the bottom end of the oil-drawing groove 241, or it can be set to be higher than the bottom end of the oil-drawing groove 241.

[0049] Furthermore, the rotating body 24 is cylindrical or conical. The rotating body 24 is set in a cylindrical or conical shape to reduce the resistance when the rotating body 24 rotates together with the axis of rotation.

[0050] In some embodiments, a notch 242 is formed on the outer wall of the rotating body 24, and an oil-drawing groove 241 is located within the notch 242. The position of the oil-drawing groove 241 within the notch 242 is arranged relative to the direction in which the heat transfer oil 50 enters the notch 242. In this embodiment, a notch 242 is provided on the outer wall of the rotating body 24, and the oil-drawing groove 241 is disposed within the notch 242. The notch 242 can store heat transfer oil 50 for a short time during rotation, so that the heat transfer oil 50 can enter the oil-drawing groove 241 more conveniently when the rotating body 24 is rotating. When the rotating body 24 has other shapes, the shape advantage can be utilized without providing a notch 242.

[0051] Furthermore, there are two notches 242, and the two notches 242 are arranged centrally symmetrically on the outer wall of the rotating body 24. (Refer to...) Figure 2 , Figure 3 The orientation of the two notches 242 is preferably matched with the rotation direction. The arrangement of the two notches 242 can further increase the oil intake and accelerate the cooling rate of the rotor 23.

[0052] Furthermore, the cross-sectional diameter of the upper end of the rotating body 24 is smaller than that of the lower end, and the upper end of the rotating body 24 is inserted into the rotating shaft and interference-fitted with the rotating shaft. In this embodiment, the upper end of the rotating body 24 extends to the bottom end of the rotating shaft 21, that is, the rotating shaft 21 is sleeved on the outside of the rotating shaft, and the interference fit between the two makes the connection more stable. The cross-sectional diameter of the upper end of the rotating body 24 is smaller than that of the lower end. After the rotating shaft 21 is fixed to the upper end, it is preferable that the outer wall of the upper end of the rotating body 24 is flush with the outer wall of the rotating shaft 21, thereby reducing rotational resistance.

[0053] In some embodiments, the rotating mechanism further includes bearings, with bearings respectively provided at the top and bottom of the rotating shaft; a bearing seat 14 is provided inside the housing, the bearing seat 14 extends from the inner wall of the housing toward the rotating shaft and abuts against the bearing at the bottom; the ultra-high speed motor includes an end cover 40, the end cover 40 is provided on the top of the housing and forms a through hole, the rotating shaft extends into the housing through the through hole, and the bearing at the top of the rotating shaft abuts against the inner wall of the end cover 40.

[0054] Reference Figure 1 In this embodiment, the space within the housing 10 is divided into a first cavity 11 and a second cavity 12 by the abutment between the bearing 22 and the bearing seat 14 inside the housing 10, preventing the heat transfer oil 50 from entering the second cavity 12. Specifically, a bearing seat 14 is provided in the middle of the housing 10, and a reserved hole is provided in the center of the bearing seat 14. The bearing fitted on the rotating shaft is located in the reserved hole of the bearing seat 14. The oil level of the heat transfer oil 50 in the housing 10 does not exceed the position of the bearing seat 14.

[0055] In this embodiment, the through hole on the end cap 40 facilitates the insertion of the rotating shaft 21 into the housing 10; the bearing 22 at the top of the rotating shaft 21 abuts against the end cap 40. The bearing 22 is positioned on the rotating shaft 21 higher than the position of the oil injection hole 212.

[0056] In some embodiments, a plurality of fins 15 are formed on the outer periphery of the housing 10 for heat dissipation, and the plurality of fins 15 are evenly distributed on the outer wall of the housing 10. In the embodiments of this application, the plurality of fins 15 radiate heat from the housing 10 into the surrounding air. The evenly distributed plurality of fins 15 makes heat dissipation from the housing more uniform.

[0057] In this embodiment, the specific heat dissipation process of the rotor 23 in a vacuum environment is as follows: When the motor is running, oil is drawn from the first cavity 11 by the high-speed rotation of the rotating body 24 on the shaft 21, and the heat-conducting oil 50 at the bottom of the first cavity 11 is pumped to the top along the cavity 211 of the shaft 21, and sprayed onto the inner wall of the second cavity 12 through the oil spray hole 212 at the top; under the action of gravity, the heat-conducting oil 50 flows along the inner wall to the return oil channel 13 and flows back to the first cavity 11. Through the pumping action formed by the continuous operation of the shaft 21, the heat-conducting oil 50 is circulated between the first cavity 11, the shaft 21, the housing 10, and the first cavity 11. During the circulation of the heat transfer oil 50, the heat generated by the motor rotor 23 is transferred to the heat transfer oil 50 flowing in the cavity 211. As the heat transfer oil 50 is sprayed onto the inner wall of the housing 10 and flows through the return oil channel 13, the heat is transferred to the housing 10. The heat dissipation fins 15 on the outer wall of the housing 10 radiate the heat on the housing 10 to the surrounding air, thus achieving effective cooling of the rotor 23 in a vacuum environment.

[0058] The heat dissipation method of this application embodiment does not rely on air medium for heat radiation heat dissipation, thus achieving the cooling of rotor 23. It has a simple structure, low wind wear loss of rotor 23, and can effectively solve the heat dissipation problem of rotor 23 of ultra-high speed motor in ultra-high vacuum environment.

[0059] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An ultra-high-speed motor, characterized in that: The device includes a housing, a rotating mechanism, and a stator. The housing contains heat-conducting oil, the rotating mechanism extends into the housing, and the stator is mounted on the inner wall of the housing. The rotating mechanism includes a shaft, a rotor, and a rotating body. The rotor is mounted on the shaft, and a cavity is formed within the shaft. One end of the shaft, which extends into the heat-conducting oil, is connected to the rotating body to draw the heat-conducting oil into the cavity. An oil spray hole is formed at the end of the shaft away from the rotating body, and the oil spray hole communicates with the cavity to spray the heat-conducting oil entering the cavity into the housing. The housing includes a first cavity and a second cavity separated by an upper and lower part. The heat transfer oil is contained in the lower first cavity, and the rotor and the stator are located in the upper second cavity. The inner wall of the second cavity has a plurality of oil return channels, which are connected to the first cavity. The heat transfer oil passes through the cavity and is sprayed out through the oil injection hole into the second cavity and flows to the oil return channels so that the heat transfer oil flows back to the first cavity.

2. The ultra-high-speed motor according to claim 1, characterized in that, The cross-section of the oil return channel is shaped like a waist hole.

3. The ultra-high-speed motor according to claim 1, characterized in that, The inlets of the multiple oil return channels are evenly distributed on the inner wall of the housing of the second cavity.

4. The ultra-high-speed motor according to claim 1, characterized in that, The upper surface of the stator is flush with the bottom of the inlet of the oil return channel.

5. The ultra-high-speed motor according to any one of claims 1 to 4, characterized in that, An oil-drawing groove is formed on the outer wall of the rotating body, and a blind hole is formed at one end of the rotating body that is connected to the rotating shaft. The blind hole extends along the axial direction of the rotating body, and the oil-drawing groove communicates with the cavity of the rotating shaft through the blind hole.

6. The ultra-high-speed motor according to claim 5, characterized in that, The rotating body is cylindrical or conical in shape.

7. The ultra-high-speed motor according to claim 5, characterized in that, A notch is formed on the outer wall of the rotating body, and the oil-drawing groove is located inside the notch. The position of the oil-drawing groove inside the notch is set relative to the direction in which the heat-conducting oil enters the notch.

8. The ultra-high-speed motor according to claim 7, characterized in that, The number of the notches is two, and the two notches are arranged in a centrally symmetrical manner on the outer wall of the rotating body.

9. The ultra-high-speed motor according to claim 5, characterized in that, The cross-sectional diameter of the upper end of the rotating body is smaller than that of the lower end, and the upper end of the rotating body is inserted into the rotating shaft and is interference-fitted with the rotating shaft.

10. The ultra-high-speed motor according to any one of claims 1 to 4, characterized in that, The rotating mechanism also includes bearings, with the bearings respectively disposed at the top and bottom of the rotating shaft; a bearing seat is disposed inside the housing, the bearing seat extending from the inner wall of the housing toward the rotating shaft and abutting against the bearing at the bottom; the ultra-high speed motor includes an end cover, the end cover being disposed at the top of the housing and forming a through hole, the rotating shaft extending into the housing through the through hole, and the bearing at the top of the rotating shaft abutting against the inner wall of the end cover.

11. The ultra-high-speed motor according to any one of claims 1 to 4, characterized in that, Multiple fins are formed on the outer periphery of the shell for heat dissipation, and the multiple fins are evenly distributed on the outer wall of the shell.

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